Prepaid Sim Card is invalid? Please help!

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I have bought a pre paid sim card for my iphone today. I was finishing activating it until I was at "summary" (last step). The page did not fully load, like as if it froze. So I tried activating it again at the first page but it says my sim card is invalid. My phone is unlocked. What am I suppose to do now? I really do not want to buy another sim card..